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This is a downside if you're removing +1/+1 counters or similar, but removing a lore counter from a saga is all upside, keeping it in play for another turn and rebuying your earlier saga abilities

Malcolm, Keen-Eyed Navigator and Breeches, Brazen Plunderer This is the only super-obvious one on my list: a Pirate tribal build with plenty of unblockable creatures in order to trigger Malcolm

Legendary Sorceries There are only six of these and they vary widely in power level, both individually and as a mechanically

It has Suspend 3, and just like Black Lotus, you can sacrifice it to add three mana of any color to your mana pool